Metaball model based soft tissue deformation method

Abstract

The invention provides a metaball model based soft tissue deformation method. The method comprises the four steps of: a stage of constructing a topological structure of a metaball model, wherein a Voronoi diagram is generated according to an original grid model by using a Bradshow Gareth ball tree generation algorithm, the metaball model is generated, and the topological structure of the metaball model is constructed with a threshold setting method; a stage of calculating deformation of the metaball model, wherein a deformation process of a soft tissue model is simulated in combination with Laplacian coordinate restriction by using a Position Based Dynamic (PBD) algorithm; a stage of realizing a skin process of the soft tissue model, wherein distance field functions are established for metaballs in a body model respectively, and a mapping relationship between the body model and a skin grid model is established, so that the skin process is realized; and a stage of realistic rendering and real-time haptic rendering, wherein the realistic rendering is performed according to the physical deformation of soft tissues, and the real-time haptic rendering is performed based on a Geomagic Touch force feedback device. The method can truly simulate the deformation process of the soft tissues in operation and has the characteristics of strong physical realism and good timeliness.

Description

technical field [0001] The invention relates to a soft tissue deformation method based on a metaball model. Background technique [0002] With the continuous expansion and deepening of virtual reality (Virtual Reality, VR) technology in the medical field, virtual surgery (Virtual Surgery) and VR surgical simulators have attracted more and more attention. Virtual surgery technology has many advantages such as controllable surgical environment and instrument response, repeatable drills, etc., and has become the development trend of future surgical training. Doctors use VR surgical simulators for surgical training and planning, which can reduce the cost and risk of surgical training and treatment; reduce the dependence on animals and corpses in doctor training and teaching. [0003] In virtual surgery, accurate physical modeling of human tissues and organs is the key technology. Some classic mechanical models, such as finite element and proton spring models, have been applied...

AI Technical Summary

Problems solved by technology

Some classic mechanical models, such as finite element and proton spring models, have been applied to various operations, but some of these algorithms lack real-time computing capabilities, and some lack accurate expression capabilities. Therefore, it is necessary to develop more effective human soft tissue models. The physical model has become a major technical problem in virtual surgery

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